QwtSplinePolynomial Class Reference

A cubic polynomial without constant term. More...

#include <qwt_spline_polynomial.h>

Public Member Functions
	QwtSplinePolynomial (double c3=0.0, double c2=0.0, double c1=0.0)
	Constructor.
bool	operator== (const QwtSplinePolynomial &) const
	Compare two polynomials for equality.
bool	operator!= (const QwtSplinePolynomial &) const
	Compare two polynomials for inequality.
double	valueAt (double x) const
	Calculate the value of a polynomial for a given x.
double	slopeAt (double x) const
	Calculate the value of the first derivate of a polynomial for a given x.
double	curvatureAt (double x) const
	Calculate the value of the second derivate of a polynomial for a given x.

Static Public Member Functions
static QwtSplinePolynomial	fromSlopes (const QPointF &p1, double m1, const QPointF &p2, double m2)
	Find the coefficients for the polynomial including 2 points with specific values for the 1st derivates at these points.
static QwtSplinePolynomial	fromSlopes (double x, double y, double m1, double m2)
	Find the coefficients for the polynomial from the offset between 2 points and specific values for the 1st derivates at these points.
static QwtSplinePolynomial	fromCurvatures (const QPointF &p1, double cv1, const QPointF &p2, double cv2)
	Find the coefficients for the polynomial including 2 points with specific values for the 2nd derivates at these points.
static QwtSplinePolynomial	fromCurvatures (double dx, double dy, double cv1, double cv2)
	Find the coefficients for the polynomial from the offset between 2 points and specific values for the 2nd derivates at these points.

Public Attributes
double	c3
	coefficient of the cubic summand
double	c2
	coefficient of the quadratic summand
double	c1
	coefficient of the linear summand

Detailed Description

A cubic polynomial without constant term.

Constructor & Destructor Documentation

QwtSplinePolynomial()

QwtSplinePolynomial::QwtSplinePolynomial ( double  a3 = 0.0, double  a2 = 0.0, double  a1 = 0.0  )

inline

Constructor.

Member Function Documentation

curvatureAt()

double QwtSplinePolynomial::curvatureAt ( double  x ) const

inline

Calculate the value of the second derivate of a polynomial for a given x.

fromCurvatures() [1/2]

QwtSplinePolynomial QwtSplinePolynomial::fromCurvatures ( const QPointF &  p1, double  cv1, const QPointF &  p2, double  cv2  )

inlinestatic

Find the coefficients for the polynomial including 2 points with specific values for the 2nd derivates at these points.

fromCurvatures() [2/2]

QwtSplinePolynomial QwtSplinePolynomial::fromCurvatures ( double  dx, double  dy, double  cv1, double  cv2  )

inlinestatic

Find the coefficients for the polynomial from the offset between 2 points and specific values for the 2nd derivates at these points.

fromSlopes() [1/2]

QwtSplinePolynomial QwtSplinePolynomial::fromSlopes ( const QPointF &  p1, double  m1, const QPointF &  p2, double  m2  )

inlinestatic

Find the coefficients for the polynomial including 2 points with specific values for the 1st derivates at these points.

fromSlopes() [2/2]

QwtSplinePolynomial QwtSplinePolynomial::fromSlopes ( double  dx, double  dy, double  m1, double  m2  )

inlinestatic

Find the coefficients for the polynomial from the offset between 2 points and specific values for the 1st derivates at these points.

operator!=()

bool QwtSplinePolynomial::operator!= ( const QwtSplinePolynomial &  other ) const

inline

Compare two polynomials for inequality.

operator==()

bool QwtSplinePolynomial::operator== ( const QwtSplinePolynomial &  other ) const

inline

Compare two polynomials for equality.

slopeAt()

double QwtSplinePolynomial::slopeAt ( double  x ) const

inline

Calculate the value of the first derivate of a polynomial for a given x.

valueAt()

double QwtSplinePolynomial::valueAt ( double  x ) const

inline

Calculate the value of a polynomial for a given x.

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The documentation for this class was generated from the following file:

• /home/runner/work/QWT/QWT/src/plot/qwt_spline_polynomial.h